Boring bar



Jan. 15, 1929. 1,698,861

A. H. WADELL' BORING BAR- Filed Nov. 1925 4 fir? 2 0 /9 mvsmon warmlhxat, A

ATT NEY Fatented Jan. 15, 1929.

UNITED STATES ALBERT H. WADELL, OF NEWARK, NEW JERSEY.

BORING BAR.

Original application filed May 28, 1924, Serial No. 716,389.

Divided and this application filed November 7,

1925. Serial No. 67,476.

This invention relates to an improved boring bar whien is adapted foruse in boring the inside of a cylindrical element such as a bearing andis particularly adapted for use in that type of machine employed inboring the bearings of crank cases, one of such machines being describedand illustrated in my ap lication for patent filed May 28, 192 1, erialNumber 716,389 and of which case this appli cation is a division.

The object of the invention is to provide a bar in which the tools canbe quickly and accurately adjusted, both longitudinally and radiallyrelative to the bar.

The invention is illustrated in the accom panying drawing in whichFigure 1 is a top view of the boring bar showing a set of cutters andtheir holding and adjusting means. Figure 2 is an enlarged section takenon line 22 on Figure 1. Figure 3 is an enlarged cross section taken online 3-3 on Figure 1.

l: have not shown a machine in which the bar is used since it is adaptedfor use in various machines, the bar being mounted in bearings and whenit is turned by a suitable handle 10 the said bar shownat 11 is advancedby reason of a screw-threaded part shown 12, being arranged in a nut 13.The bar 11 or the larger portion of its length is hollow, the bore of 14extending to one end oi? the bar, this end receiving the end ofextension 12 which can be fastened by a pin 15. The bar is provided withthe required number of slots 16 and the bar shown in Figure 1 beinbroken away in places, illustrates one equipped with four such slots. Inthe bore of the bar I provide a tool block consisting of a member 17 anda member 18 fastened tog by suitable means such as the screws 19. Themember 18 is made to fit the upper part oi the bore 1 1 and the block isslidable longitudinally in the bar, and when it is desired to 10 k itagainst such sliding movement, the s rews 20 are screwed down so thatthey bind ,ninst the bottom of the bar and at the same time press theperiphery of the member 18 so that it binds against the inside of thebore. These lock screws 20 are accessible through the slot 16. Themember 17 is provided the center with a bridge 21 which has an openingin which the tool 22 can slide.

The tool when adjusted is held in place by a lock screw 23., In order toadjust the tool, however, I arrange a foot 24 which is prevented againstturning by its engagement with the sides of the recess 25 and which isscrew-threaded and receives the screw 26. The screw 26 is mounted in arecess 27 in the head 21, which recess, however, is not screwthreadedand when the screw 26 is operated by a key wrench through the opening28, the tool 22 can be accurately adjusted by forcing it out by means ofthe foot 2 1 and it is properly positioned. Then the lock screw 23 istightened and the tool 22 is held by not only this loci; screw but thefoot 2 1.

It will thus be evident that I have devised a boring bar in which thetool can be longitudinally adj nsted and also radially adjusted. Thisadjustment can be quickly accomplished and this with accuracy. It isusual in machines of this kind when boring the bearings of the-crankcases of automobile engines, to adjust these tools depending on distanceseparating bearings, the number of bearings, and their size.

It will be evident, also that slight modifications can be made in thesizes, arrangement, and form of the parts without departing from thescope of the invention.

I claim:

1. A boring bar having a longitudinal bore and a slot, a block fittingthe bore and slidable therein, a screw in the block and engaging thewall of the bore for locking the block against movement, a tool in theblock, a foot under the tool, and a screw in screw-threaded engagementwith the foot and bearing on the bottom of the bore for adjusting thetool.

2. A boring bar having a longitudinal bore and slot, a block fitting theupper part of the bore and having a bridge extending into the slot, ascrew in the block and accessible through the slot and bearing on thebottom of he bore for clamping the block in place, a tool in the bridgeof the block, and a screw bearing on the bottom of the bore and disposedso as to be effective on the end of the tool for its adjustment.

In testimony whereof I aflix my signature ALBERT H. WADELL.

